An expansive view of the GB/BB/1905 fast battleship design

In 1973, I decided to see how far many of my friend Cliff's designs could be stretched, primarily by using lighter machinery. I have a page with a pencil sketch and specifications for a version with machinery that produced 30 SHP/ton. The original concept was to have a light armament, but good armor protection. That meant 6-12in/45 BLR and 8-6in QF guns. The armor basis was 13.4in and was in the "all-or-nothing" pattern. I used the citadel length from the drawing, even though Springsharp thinks that is short. The dimensions were 680ft x 87.7ft x 28ft with a displacement of 25,000 tons. I have assumed that meant normal, not standard displacement. This is the Springsharp report:

GB/BB/1905, Great Britain Battleship laid down 1905 (Engine 1927)

Displacement:
 22,756 t light; 23,532 t standard; 25,000 t normal; 26,175 t full load

Dimensions: Length overall / water x beam x draught
 680.00 ft / 680.00 ft x 87.70 ft x 28.00 ft (normal load)
 207.26 m / 207.26 m x 26.73 m  x 8.53 m

Armament:
      6 - 12.00" / 305 mm guns (3x2 guns), 864.00lbs / 391.90kg shells, 1905 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, majority forward, 1 raised mount - superfiring
      8 - 6.00" / 152 mm guns (4x2 guns), 108.00lbs / 48.99kg shells, 1905 Model
   Quick firing guns in turrets (on barbettes)
   on side, all amidships
 Weight of broadside 6,048 lbs / 2,743 kg
 Shells per gun, main battery: 80

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 13.4" / 340 mm 355.00 ft / 108.20 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 80 % of normal length

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 13.4" / 340 mm 8.00" / 203 mm  13.4" / 340 mm
 2nd: 3.63" / 92 mm 3.63" / 92 mm  3.63" / 92 mm

   - Armour deck: 4.50" / 114 mm, Conning tower: 6.75" / 171 mm

Machinery:
 Oil fired boilers, steam turbines, 
 No drive to shaft, 4 shafts, 86,351 shp / 64,418 Kw = 28.00 kts
 Range 6,200nm at 15.00 kts
 Bunker at max displacement = 2,643 tons

Complement:
 993 - 1,292

Cost:
 £1.813 million / $7.252 million

Distribution of weights at normal displacement:
 Armament: 756 tons, 3.0 %
 Armour: 9,297 tons, 37.2 %
    - Belts: 3,396 tons, 13.6 %
    - Torpedo bulkhead: 0 tons, 0.0 %
    - Armament: 2,395 tons, 9.6 %
    - Armour Deck: 3,382 tons, 13.5 %
    - Conning Tower: 124 tons, 0.5 %
 Machinery: 2,726 tons, 10.9 %
 Hull, fittings & equipment: 9,978 tons, 39.9 %
 Fuel, ammunition & stores: 2,244 tons, 9.0 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   49,094 lbs / 22,269 Kg = 56.8 x 12.0 " / 305 mm shells or 4.6 torpedoes
 Stability (Unstable if below 1.00): 1.03
 Metacentric height 4.4 ft / 1.3 m
 Roll period: 17.6 seconds
 Steadiness - As gun platform (Average = 50 %): 82 %
   - Recoil effect (Restricted arc if above 1.00): 0.71
 Seaboat quality  (Average = 1.00): 1.65

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.524
 Length to Beam Ratio: 7.75 : 1
 'Natural speed' for length: 26.08 kts
 Power going to wave formation at top speed: 50 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): -1.00 degrees
 Stern overhang: -2.00 ft / -0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  32.00 ft / 9.75 m
    - Forecastle (20 %): 30.00 ft / 9.14 m
    - Mid (64 %):  30.00 ft / 9.14 m (22.00 ft / 6.71 m aft of break)
    - Quarterdeck (15 %): 22.00 ft / 6.71 m
    - Stern:  22.00 ft / 6.71 m
    - Average freeboard: 27.28 ft / 8.31 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 58.7 %
  - Above water (accommodation/working, high = better): 213.6 %
 Waterplane Area: 40,622 Square feet or 3,774 Square metres
 Displacement factor (Displacement / loading): 120 %
 Structure weight / hull surface area: 158 lbs/sq ft or 772 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.93
  - Longitudinal: 1.91
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is excellent
 Room for accommodation and workspaces is excellent
 Ship has slow, easy roll, a good, steady gun platform
 Excellent seaboat, comfortable, can fire her guns in the heaviest weather